BOR-60

[1] Originally it used highly enriched uranium, but in 1981 it switched over to burning MOX fuel containing weapons-grade plutonium from decommissioned nuclear warheads.

The BOR-60 reactor is designed to operate on a mixed-oxide MOX fuel, based on UO2 (highly enriched uranium, 45%-90% 235U) and PuO2.

[7] The reactor vessel also has several experimentation channels in the outer hull, with widths varying from 90mm to 230mm.

[6] BOR-60 allows for wide-scale tests of fuels, materials, coolants and detectors for various fast reactors.

[9] It is capable or burning a wide range of fuels, including weapons-grade material, as well as various metallic, oxide, nitride and carbide variations.

Diagram of the reactor core of the BOR-60 experimental fast-neutron reactor. (Note that the fuel and blanket assemblies can be easily interchanged)
Grey: fuel assemblies
White: blank assemblies
Blue: experimental material assemblies
Green: experimental fuel assemblies
Red: control rods
Yellow: experimentation channels